2004 Chevrolet cavalier No spark

Dave Owner/Technician Michigan Posted   Latest  
Resolved
Driveability
2004 Chevrolet Cavalier 2.2L (F L61) 5-spd (5T45MI)

Looking for good crank sensor waveform.

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Scott Manager
California
Scott
 

diag​.​net/msg/m4amfqao4t…

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Dave Owner/Technician
Michigan
Dave
 

Thanks Scott. Any Idea Why Mine would have a nice pattern but only 2.5 - 3 volt peaks?

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Michael Technician
Indiana
Michael
 

Do you have injector pulse? If so, stop looking at the crank sensor and replace the ignition module. If not, check c104 for connection issues. Low amplitude is usually a result of air gap too large. The sensor being behind the starter, makes for poor visual inspection. If you could see it I would look for sensor jacking. Mike

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Ray Diagnostician
Ontario
Ray
 

Dave, the 2 wire inductive ckp sensor producing 2.5-3v could be normal while cranking.

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Dave Owner/Technician
Michigan
Dave Resolution
 

Had Signal at crank sensor but dead at the PCM. Wire insulation was crimped in the terminal. not sure how it worked previously. New terminals in the connector and all is well.

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